Ceylon Sapphire Inclusions

First Published: 7 September 2026

Ceylon Sapphire Inclusions

Explore Ceylon sapphire inclusions in Hyperion, the Lotus Gemology inclusion database. Hyperion contains photomicrographs of inclusions and internal features in natural sapphires from Sri Lanka (Ceylon), documented with information on treatment, lighting conditions, field of view, photographer and published references.

“Bubbly” melted crystals in a heat-treated sapphire from Sri Lanka.
Yellow sapphires from Sri Lanka do not normally contain rutile silk, which is why yellow star sapphires are so rare. Instead they contain tiny, magnesium-bearing particles exsolved in the same pattern as rutile. Care must be taken not to confuse these natural inclusions with the partially-dissolved silk of heat-treated stones.
Fingerprints betray the underlying atomic symmetry. In this case, this iridescent fingerprint lies along a prism face, as demonstrated by its rectilinear form.
Arrow-shaped rutile needles lie frozen within this unheated sapphire from Sri Lanka.
An arrow-shaped rutile needle lies frozen within this unheated sapphire from Sri Lanka. Note the small daughter crystal at the broad end.
Irregular crystals float above exsolved rutile silk in this untreated sapphire from Sri Lanka.
Small crystal plates against a backdrop of exsolved silk in this Sri Lankan sapphire.
A thin crystal plate alongside a brown crystal of what is probably phlogopite mica enhance the interior of this sapphire from Serendib.
A heat-induced discoid inclusion in a heat-treated sapphire from Sri Lanka.
When a silky sapphire is heated to a high enough temperature, titanium from the rutile silk is forced into solid solution, coloring the stone blue. But the silk may also contain other elements that cannot dissolve into sapphire so readily, leaving behind silk “skeletons,” as shown here.
A euhedral birefringent crystal floats against a canvas of rutile silk in this untreated sapphire from Sri Lanka.
Primary rutile crystals caught amidst secondary rutile silk in this sapphire from Sri Lanka.

Ceylon sapphire inclusions may include mineral crystals, rutile silk, healed fissures, fluid inclusions, negative crystals, growth features and other internal features formed during or after crystal growth. Such features are important to gemologists because they can provide evidence useful in identifying sapphire and evaluating a possible Sri Lankan origin.

Ceylon Sapphire Inclusion Photomicrographs

The Hyperion Ceylon sapphire gallery includes microscopic features documented in sapphires from Sri Lanka (Ceylon). Each entry is accompanied by descriptive information and, where available, references to the gemological literature.

What Inclusions Can Reveal About Ceylon Sapphire

Inclusions are an important part of geographic origin determination in sapphire. Their form, composition, orientation and associations can provide evidence that, when considered together with other gemological properties, may support or contradict a Sri Lankan origin.

Hyperion combines inclusion photomicrography with supporting gemological information so that individual features can be compared with documented examples from Ceylon sapphires.

About Hyperion

Hyperion is the Lotus Gemology searchable inclusion database. It allows users to browse gemstone inclusions by gem type, geographic origin, treatment and keyword.

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